I don't actually think it matters who leads...at all. Besides, if Ray's so well-known, he'll get called on for strategy anyway, because that's how any leader manages talent.
But such things aside, we should get the teams straightened out if all the characters want to participate.
So, to even it out, the largest cabins would likely be Olympian, starting from Apollo and Ares, Hecate and Athena, Aphrodite and Hermes, Hephaustus and Demeter, then working down towards groups of Hebe and Nike, Nemesis and Hypnos, Iris and Tyche, Hades and Dionysus.
(The groups are in descending order of size, and the pairs are what I currently consider to be cabins of around equal size. Apollo and Ares are around 20, to 16, 12, 10 and descending to Dionysus, which is 1-3.)
I don't know if that helps anything or not, but we're not even sure how teams are formed. (Taken from the wiki, in Lightning Thief the two teams were Percy, Athena, Apollo, and Hermes (the latter were the two biggest cabins) VS Dionysus, Demeter, Aphrodite, Ares, and Hephaestus (all the other cabins with campers).).
We're not sure if a cabin is designated leader, or teams are predetermined with no leaders at all. Whatever it is, @LordZeus, it's certainly not worth arguing over.
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